The question of whether or not you should use an HVAC during painting is a difficult one to answer with absolute certainty -- but it is certain that using an HVAC will not put you at any greater risk of health issues. In fact, according to the United States Consumer Product Safety Commission’s neat guide on the healthiest indoor painting practices the best thing you can do is open up all of your windows and let the air flow in naturally while also employing some fans to blow the fumes out. While an air conditioning unit “should not be substituted for the use of a fan” it certainly won’t hurt to leave yours running during painting. Because so many people undertake painting jobs during the hot and humid summer months it can be tempting to flip on the A/C to cool the place down while you’re hard at work -- and luckily you can do just that!
Another plus to using an HVAC unit during painting is that it can help to remove pesky moisture and humidity from the air. If you live in a particularly humid region, then an HVAC unit being turned on may just feel like a complete lifesaver.
It is a totally normal question to wonder if using an HVAC unit during painting is safe -- and it most definitely is. While you should also be opening windows and turning on some high-powered fans, the HVAC unit can go a long way in keeping you calm and cool during the stressful painting session.